The PATCH_MAX_SIZE macro should contain the maximum of all family patch
sizes.
Since these sizes are defined in an other place than this macro, let's add
a reminder to them so people will remember to verify PATCH_MAX_SIZE
correctness when modifying a family patch size or adding a new family.
Signed-off-by: Maciej S. Szmigiero <m...@maciej.szmigiero.name>
---
arch/x86/include/asm/microcode_amd.h | 1 +
arch/x86/kernel/cpu/microcode/amd.c | 4 ++++
2 files changed, 5 insertions(+)
diff --git a/arch/x86/include/asm/microcode_amd.h
b/arch/x86/include/asm/microcode_amd.h
index 209492849566..8ea477fbc65f 100644
--- a/arch/x86/include/asm/microcode_amd.h
+++ b/arch/x86/include/asm/microcode_amd.h
@@ -41,6 +41,7 @@ struct microcode_amd {
unsigned int mpb[0];
};
+/* Maximum patch size of all supported families */
#define PATCH_MAX_SIZE PAGE_SIZE
#ifdef CONFIG_MICROCODE_AMD
diff --git a/arch/x86/kernel/cpu/microcode/amd.c
b/arch/x86/kernel/cpu/microcode/amd.c
index 764dac82c03f..cc38182c76d2 100644
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -199,6 +199,10 @@ static bool verify_patch(u8 family, const u8 *buf, size_t
buf_size, bool early)
patch_size = hdr[1];
+/*
+ * If you modify these values or add a new one also check whether
+ * PATCH_MAX_SIZE in include/asm/microcode_amd.h needs updating, too.
+ */
#define F1XH_MPB_MAX_SIZE 2048
#define F14H_MPB_MAX_SIZE 1824
#define F15H_MPB_MAX_SIZE 4096
